diff --git a/exampleSite/config.yaml b/exampleSite/config.yaml
index bc07d59..545116d 100644
--- a/exampleSite/config.yaml
+++ b/exampleSite/config.yaml
@@ -9,7 +9,7 @@ languages:
         languageName: English
         title: Example Site
         weight: 1
-    zh-CN:
+    zh-cn:
         languageName: 中文
         title: 演示站点
         weight: 2
@@ -26,7 +26,7 @@ disqusShortname: hugo-theme-stack
 googleAnalytics:
 
 # Theme i18n support
-# Available values: en, fr, id, ja, ko, pt-br, zh-CN, zh-TW, es, de, nl, it, th, el, uk, ar
+# Available values: en, fr, id, ja, ko, pt-br, zh-cn, zh-tw, es, de, nl, it, th, el, uk, ar
 DefaultContentLanguage: en
 
 # Set hasCJKLanguage to true if DefaultContentLanguage is in [zh-cn ja ko]
diff --git a/exampleSite/content/_index.zh-CN.md b/exampleSite/content/_index.zh-cn.md
similarity index 100%
rename from exampleSite/content/_index.zh-CN.md
rename to exampleSite/content/_index.zh-cn.md
diff --git a/i18n/pt-BR.yaml b/i18n/pt-br.yaml
similarity index 100%
rename from i18n/pt-BR.yaml
rename to i18n/pt-br.yaml
diff --git a/i18n/zh-CN.yaml b/i18n/zh-cn.yaml
similarity index 100%
rename from i18n/zh-CN.yaml
rename to i18n/zh-cn.yaml
diff --git a/i18n/zh-TW.yaml b/i18n/zh-tw.yaml
similarity index 100%
rename from i18n/zh-TW.yaml
rename to i18n/zh-tw.yaml